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Grease composition

Active Publication Date: 2011-06-09
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The MoDTC, when used in the grease, exerts its effect through chemical change. The effect of the MoDTC becomes thus limited during the startup or low-load operation conditions where the temperatures of the grease and the sliding parts are low. This results in a problem that the friction reduction effect of the grease cannot be obtained sufficiently depending on the conditions of use. In general, the grease is

Problems solved by technology

The reduction of the friction coefficient of the sliding mechanism by improvement of the lubricant leads to not only increases in operation efficiency and part life but also decreases in noise and vibration.

Method used

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  • Grease composition

Examples

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Comparison scheme
Effect test

example 1

[0046]The grease composition of Example 1 was prepared by using a mineral oil (kinematic viscosity: 30 mm2 / s at 40° C.) as a base oil and adding to the base oil 25 mass % of lithium 12-hydroxystearate as a thickener and 0.1 mass % of SiC nanoparticles (average primary particle size: 7 nm) based on the total amount of the grease composition.

example 2

[0047]The grease composition of Example 2 was prepared by the same procedure as that of Example 1, except for using SiC nanoparticles (average primary particle size: 28 nm) in place of the SiC nanoparticles (average primary particle size: 7 nm).

example 3

[0048]The grease composition of Example 3 was prepared by the same procedure as that of Example 1, except for: using lithium stearate as the thickener in place of the lithium 12-hydroxystearate; and using diamond nanoparticles (average primary particle size: 5 nm, single crystal) in place of the SiC nanoparticles (average primary particle size: 7 nm).

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Abstract

There is provided a grease composition, including: a base oil; a metal soap thickener formed of at least one metal selected from the group consisting of lithium, calcium, magnesium and aluminum and a fatty acid containing at least one selected from the group consisting of a hydroxyl group, a carboxyl group and a carboxylic acid metal salt group in each molecular structure; and nanoparticles formed of at least one selected from the group consisting of oxides, carbides and diamond materials.

Description

TECHNICAL FIELD[0001]The present invention relates to a grease composition and, more particularly, to a nanoparticle-containing grease composition for application to sliding parts. The grease composition of the present invention is suitably used for lubrication of sliding parts of general industrial machines, vehicles and electrical products (e.g. sliding bearings or rolling bearings of motors) and other friction-susceptible mechanical parts.BACKGROUND ART[0002]Conventionally, lubricants are used in various mechanical machines so as to reduce friction coefficients of sliding mechanisms. The reduction of the friction coefficient of the sliding mechanism by improvement of the lubricant leads to not only increases in operation efficiency and part life but also decreases in noise and vibration.[0003]There is, for example, disclosed a liquid lubricant composition that contains nanoparticles and, when applied to a steel sliding part of an internal combustion engine, can reduce a friction ...

Claims

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Application Information

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IPC IPC(8): C10M125/02B82Y30/00
CPCC10M141/12C10M169/06C10N2250/10C10N2240/046C10N2240/02C10N2230/06C10N2220/082C10N2220/022C10N2210/06C10N2210/03C10N2210/02C10N2210/01C10M2219/068C10M2201/041C10M2201/061C10M2201/062C10M2201/10C10M2203/1006C10M2205/0285C10M2207/0406C10M2207/1265C10M2207/1276C10M2207/1285C10M2207/2805C10M2207/281C10M2207/2825C10M2207/2835C10M2207/289C10M2209/1033C10N2010/02C10N2010/04C10N2010/06C10N2010/12C10N2020/02C10N2020/06C10N2030/06C10N2040/02C10N2050/10C10N2040/046
Inventor MABUCHI, YUTAKANAKAGAWA, AKIRA
Owner NISSAN MOTOR CO LTD
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